g-askin



(No Model.)

B. GASKIN. ROTARY SAW SHARPENER.

' 4 Sheets-Shet 1.

No. 360,679. Patented Apr. 5, 1887.

WITNESSES @M.

ATTORNE N. versus. Phnwljlhegnpmr. Washington, 0. c.

(No Model.) 4 Sheets-Sheet 2.

R. GASKIN.

ROTARY SAW-SHARPENER.

Patented Apr. 5, 1887.

nwmon 2% BY I ATTORNEYS.

U WITNESSES:

N. PETERS. mwuxmnphur, Washinglan. ac,

(No Model.) 4 Sheets-Sheet 3.

R. GASKIN.

ROTARYSAW SHARPENBR.

Patented Apr. 5, 1887;

INVENTOR 24% BY M ATTORNEYS.

WITNESSES 1 6am N. PETERS. Phuwulhoghpher, Waahingtun, 11 C (No Model.)4 Sheets-Sheet 4.

R. GASKIN.

ROTARY SAW SHARPENER.

s. N N T u A d Y e. B Lb n e t a P i 9. a ll v M UNITED STATES PATENTOEEIcE.

ROBERT GASKIN, OF FAIRVILLE, ASSIGNOR TO HIMSELF, AND GEORGE MEALEY, OFPORTLAND, NEW BRUNSVIOK, CANADA.

ROTARY SAW-SHARPENER.

SPECIFICATION forming part of Letters Patent No. 360,679, dated April 5,1887.

Application filed November 11, 1886. Serial No. 218.522. (No model.)

To all whom, it may concern:

Be it known that I, ROBERT GASKIN, of Fairr ville, in the county of St.John, Province of New Brunswick and Dominion of Canada, have invented anew and Improved Rotary Saw-Sharpener, of whichthe following is a full,clear, and exact description.

The object of my invention is to provide a new and improvedrotarysaw-sharpener which is automatic and very effective in operation.

The invention consists of an adjustable sawholder mounted on a slidingframe, means for imparting forward and backward motion to the saidframe, a device for turning the saw automatically the distance of onetooth, and a stationary grindingwheel.

The invention also consists of various parts and details andcombinations of the same, as will be fully described hereinafter, andthen pointed out in the claims.

Reference is to be'had to the accompanying drawings,forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in all the figures.

Figure 1 is a plan view of my improvement, parts of the saw being brokenout. Fig. 2 is a front elevation of the same. Fig. 3 is an end elevationof the same. Fig. 4 is a sectional end elevation of the same on the line00 x of Fig. 1. Fig. 5 is a front elevation of the device for moving thesaw the distance of one tooth, and Fig. 6 is an end elevation of thesame.

The frame A, of suitable construction, is provided with guide-plates B,on which travels the carriage O, supporting the movable holder D,provided with a socket, in which turns the saw-rest D, carrying the sawE. On the holder D is mounted the shaft F, provided on one end with ahand-wheel, F, and on its opposite end with a pinion, F meshing into therack G of the carriage G. The holder D and its saw-rest D can be movedlongitudinally on the carriage G by turning the said handwheel F.

In the middle of the carriage O are secured the downwardly-extendingbrackets G, between which is held a nut, G, in which screws the threadedrodG, carrying 011 one end the hand-wheel G, and connected by its otherend with the slotted crank-arm G, secured to the shaft H, revolving insuitable bearings on the volving the saw E the distance of one tooth ata time. This device I is provided with abar, I, sliding longitudinallyin suitable bearings A attached to the main frame A; and the bar 1receives its motion from the cam Hflwhich operates alternately on thefriction-rollers l and 1 respectively mounted in suitable stand ardsattached to the said bar 1. The said bar is connected by the link 1*with the slotted arm J, attached to the shaft J, carrying theupwardlyextending arm J", having a slot, through which passes a stud, K,secured to the frame K, sliding longitudinally in suitable guides on thefront of the frame A.

The frame K supports the pin K which passes through a slot, N, in theadjustable arm or rod N, extending to the center of the saw E andcarrying the bolt O, provided with the beveled collar 0, which engagesthe central aperture of the saw E, and is held in place by the nutOiscrewing on the threaded bolt 0 on the top of the rod or arm N. Thearm or rod N is also provided with lugs N, which form a bearing for thescrew-threaded rod N having a handle, N, and carrying the sliding nut L,guided on the rod N, and provided on its lower end with the pawl L,pivoted on the said nut L, and having a wedge-shaped projection, If, onits under surface, which engages with the teeth of the saw E. The shaftH is rotated from the main shaft P by a suitable chain of geacwheels, Q.

The grinding-wheel R is attached to a spindle mounted in suitablebearings on the standards S and S, erected on the main frame A, and thespindle carries thepulley T, which is connected by means of a belt niththe driving machinery which is to 0perat-ti1e sawgrinder.

A roller, V, is mounted on an arm, V, adjustable 011 the standard S, andthe said roller V is placed in close proximity to the back of thegrinding-wheel It.

On the main frame A and on the carriage G are erected the standards U,which support the outer part of the saw E at several points. Theoperation is as follows: A forward and backward motion is imparted tothe carriage O, carrying the saw,by means of the crank-arm G on therevolving shaft H and the connecting-rod G. The forward motion of thecarriage brings the front or cutting edge of one tooth of the saw incontact with the beveled rim of the grinding-wheel R, and the rollerVforces the point of the tooth against the back of said wheel, wherebythe point is sharpened. The carriage C, after the sharpening of the baseof the tooth, recedes, so that the tooth leaves the grinding-wheel, andthe device I 110w moves the saw the distance of one tooth by means ofthe pawl L, which travels upward with its frame K sliding on the frame Aby the act-ion of the cam H, which moves the bar 1 forward, and therebycauses a rocking of the shaft J by means of the link I; and the saidshaft J imparts the necessary motion to the frame K by means of the armJ 2 engaging the pin K. The position of the cam H in relation to thecrank-arm G is such that the frame K is only moved to the right afterthe carriage O commences to recede, and the frame K remains in astationary position duringthe time that the grinding-wheel R is incontact with the tooth of the saw on the forward motion of the saidcarriage O.

When the carriage O recedes from the grind ing-wheel, the carriage Kmoves toward the grinding-wheel,and thus keeps the back of the toothagainst the beveled edge of the grinding-wheel. This motion of the frameK is continued until the point of the tooth is at. about the center ofthe beveled edge of the grinding wheel, when, on account of the peculiarform of the cam H,the frame K remains stationary until the carriage Ocarries the saw out ofeon tact. The frame K then suddenly starts towardthe grinding-wheel again and pushes the point of the tooth of the sawpast the edge of the grinding-wheel without touching it. As soon as thecarriage 0 starts toward the grindingwheel again, the frame K startsaway from it and carries the pawl L back the distance of one tooth,readyto push the saw around again as soon as the carriage O commences torecede.

The pawl L,0n account of being hinged to the nut L,is moved over thetooth on the return movement of the carriage K by the wedge shapedprojection L", and the pawl drops into the next space and engages withthe cuttingedge of the tooth, as shown in Fig. 5.

The screw-threaded rod N permits of giving more or less feed to the sawwhile grinding by turning thehandle N*.

The different arts are made adjustable, so as to accommodate saws of anydiameter; and asthe'link 1* is adjustable in the slotted arm J, thenecessary amount of throw for the frame K to move only one tooth can bereadily obtained for different saws.

The position of the back of each saw-tooth that the gear-wheel F",traveling on the rack C,causes a forward or backward movement of thesaid holder D.

Having thus fully described my invention, I claim as new and desire tosecure by Letters Patent 1. In a rotary saw-sharpener, thecombination,witharevolving grinding-wheel mounted in stationarybearings, of acarriage having a forward and backward motion, anadjustable saw-holder mounted on the said carriage, and a frame slidingon the main frame and having connection with a rod or arm provided withlugs forming bearings for a screw having asliding nut, and carrying apawl which revolves the saw on its axis on the said holder the dis tanceof one tooth, substantially as shown and. described.

2. In a rotary saw-sharpener, the combination,with a revolvinggrinding-wheel mounted in stationary bearings, of a carriage having aforward and backward movement, a sawholder mounted to slide on the saidcarriage, means for moving the said saw-holder longitudinally on thecarriage, a frame sliding on the main frame and having connection with arod or arm provided with lugsforming bearings for a screw having asliding nut, and carrying a pawl which engages the teeth of the saw, andmeans for imparting a longitudinal movement to the said frame. carryingthe pawl, substantially as shown and described.

3. In a rotary saw-sharpener, the revolving shaft H, the slottedcrank-disk G and the adjustable screw-threaded rod G, in combinationwith the carriage 0, adapted to slide on the main frame, the nut G, inwhich screws the said rod G, and which is held in brackets on the saidcarriage O, and the adjustable sawholder D, mounted to slide on the saidcarriage O, substantially as shown and described.

4:. In a rotary saw-sharpener, the carriage 0, having a forward andbackward movement, and the rack O on the said carriage, in combinationwith the saw-holder D, mounted to slide on the said carriage C andcarrying the shaft F, provided with the hand-wheel F and mounted to turnin the said saw-holder D, and the pinion F on the said shaft F, andmeshing into the rack G, substantially as shown and described.

5. In a rotary saw-sharpener, the carriage G, the adjustable rod G, theslotted crankarm G and the shaft H, carrying the bevel gear-wheel H, incombination with the shaft H carrying the bevel gear-wheel H meshing inthe said gear-wheel H, the cam H secured to the said shaft H the slidingbar I, operated by the said cam H*, the link-1*, pivotally connectedwith the said bar I, the slotted arm J, in which one end of the saidlink I is adjustable, the rocking shaft J, to which the said arm J isfastened, the arm J 2 on the said shaft J, and the frame K, havingconnection by a pin, K,with rod or arm N, provided with lugs N N,forming bearings for a screw, N hav- IIO ing a sliding nut, L, andcarrying the pawl L, pivoted the said pawl, the bolt 0, held on the. x0and connected by the pin K with the said arm said rod N, and providedwith the beveled col- J, substantially as shown and described. lar O,engaging the central aperture of the 6. In a rotary saw-sharpener, theframe K, saw, and the nut 0 screwing 0n the said bolt, sliding on themain frame A, the pin K, atsubstantially as shown and described. tachedon the said frame K, and the pawl L, ROBERT GASKIN. in combination withthe adjustable rod N, hav- Witnesses: ing the slot N, and lugs N",forming bearings J N0. L. CARLETON, for a screw, N carrying a nut, L, towhich is A. B. WALKER.

